I think for the slow telnet problem you are running into an MTU issue. Because IPSec adds overhead, sometimes packets are dropped because they are too large. Try to lower the MTU on the devices and then try telnet. Regarding your second question, VPN is used to get a private network running over the internet, so you wont need VPN to access the internet.
Finding no solution to my problem, i've switched to other tools : Easy VPN server in the router + Cisco VPN client. My 2 questions have now received a positive answer.
I was very important for me to get Internet acess through the VPN. Because we rent a dedicated server, located somewhere, and the access to this server is firewall-protected on our public IP address. Thus, when i'm outside and want to manage this serveur, i've to connect via VPN at our central office first.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...